Car wont accelerate when hot
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Car wont accelerate when hot
I've got an issue with my 93 series 6 jap spec manual fully factory apart from muffler, when the car is cold or waming up it runs perfectly, then it hits full operating temperature it won't accelerate under any load at all just backfires like hell and cuts all power. If I'm VERY gentle on the peddle it will go all the way through the rev range it's like as soon as there is bost pressure it cuts fuel, if I turn key off and back on again when running it's runs perfectly untill l I come to a low speed and it then start cutting out again. Car has a new fuel pump and fuel filter have checked all vacuum lines and MAP sensor, checked the tps all within spec, have swaped ecu with another factory one...anyone out there with any thoughts on what could be
#2
Eats, Sleeps, Dreams Rotary
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I've got an issue with my 93 series 6 jap spec manual fully factory apart from muffler, when the car is cold or waming up it runs perfectly, then it hits full operating temperature it won't accelerate under any load at all just backfires like hell and cuts all power. If I'm VERY gentle on the peddle it will go all the way through the rev range it's like as soon as there is bost pressure it cuts fuel, if I turn key off and back on again when running it's runs perfectly untill l I come to a low speed and it then start cutting out again. Car has a new fuel pump and fuel filter have checked all vacuum lines and MAP sensor, checked the tps all within spec, have swaped ecu with another factory one...anyone out there with any thoughts on what could be
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#5
Eats, Sleeps, Dreams Rotary
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Update
I replaced the fuel filter again its only dun 10k kms but thought it might have sucked up some crap, as well as the fuel line upgrade above. Took the car for a drive ran perfectly for a good 10min, parked it up for 10min then it started hesitating again, surly someone out there has run into the same thing?
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#8
Racecar - Formula 2000
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I replaced the fuel filter again its only dun 10k kms but thought it might have sucked up some crap, as well as the fuel line upgrade above. Took the car for a drive ran perfectly for a good 10min, parked it up for 10min then it started hesitating again, surly someone out there has run into the same thing?
#9
Sounds like limp mode to me. You have a boost gauge, if you reach atmospheric pressure and it seems like it fuel cuts, that's probably it. The real question is what is causing your car to enter limp mode. afaik if it can't detect the OMP it does this, if it feels like it can't control boost it does this, all it takes is a few overboost moments and it will re-engage the limp and try to keep the car in vacuum.
#10
Do you have a wideband O2 gauge? My car has had standalone ECUs on it for a long time now, so I've always been able to rely on datalogs when troubleshooting. I've occasionally done dumb things that resulted in the engine running lean, and it's surprising how many fuel system problems might go unnoticed without a wideband O2 gauge to measure that the fuel mixture is dangerously lean (which is dangerously hot in boost). In short, I agree that your problem might be a very major fuel problem, or an ignition problem, or the ECU is detecting something and intentionally cutting fuel and spark as a limiter.
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